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  3. Throughout history, man has had to accept the fact that all living things must die, but people now live longer than they used to

Throughout history, man has had to accept the fact that all living things must die, but people now live longer than they used to

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问题     Throughout history, man has had to accept the fact that all living things must die, but people now live longer than they used to. Yet, all【C1】______things still show the effect of aging, which will eventually【C2】______death. The body and the【C3】______, they do not function as well as they【C4】______in childhood and adolescence(青春期). The body provides less【C5】______against disease and is more prone(易于……的)【C6】______accident.
    A number of related causes may【C7】______to aging. Some cells of the body have a【C8】______long life, but they are not【C9】______when they die. As a person ages,【C10】______of brain cells and muscle cells decreases.  Other body cells did and are replaced by new cells. In an aging person the【C11】______cells may not be as viable(能生存的)or as capable【C12】______growth as those of a young person.
    Another factor in aging may be changes within the cells【C13】______. Some of the protein chemicals in cells【C14】______known to change【C15】______age and become less elastic. This is why the skin of old people wrinkles and hangs loose. This is also the reason old people shrink in【C16】______. There may be other more important chemical changes in the cells. Some complex cell chemicals.【C17】______DNA and RNA, store and【C18】______information that the cells need. Aging may【C19】______this process and change the information carrying molecules【C20】______they do not transmit the information as well.
【C17】
选项 A、as such
B、as that
C、as though
D、such as
答案D
解析 such as为复合连接词，引出同位语DNA and RNA，对前面的some complex cell chemicals 起列举作用，可译为“例如”。as though 似乎，as that 象那一样，as such确切而言,完全地，例：I didn’t have a nervous breakdown as such，it was more a reaction to overwork．我不是真的得了精神崩溃，那只是工作过度的反应。 such as这两个单词既可分开用，也可合起来用。Such accommodation as she could find was expensive．她所找的住处很贵。There are many people in the hall，such as…有许多人在大厅里，例如……
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大学英语四级

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